Solution : https://service.sap.com/sap/support/notes/940849 (SAP Service marketplace login required)
Key words :
terms cl_rexa_acc_system_fc=========cpcl_rexa_acc_system_fc=========cm00fif_rera_acc_system~display_documentrescis reason, attached source code corrections, service charge settlement, objects_objref_not_assigned runtime error, cl_rexa_acc_system_fc program, program error, log display, fi documents, detail display, support package